Cryptic crossword No 3,945

Across

1. See 1
2. Lump of something turning young horse's stomach (4)
3. Avoid the missing vowels round? Great resolution! (2,2)
4. Excuse getting both Caliban and Cain out of prison (5)
5. Something in your eye when drinking last of precious wine (7)
6. Get shot of initially agreeable relative (4)
7. Unprofessional cop openly pockets a little drink (7)
8. Organs of state heartlessly start on immigrants (5)
9. Pop art? (4)
10. Two informants – one going underground (4,3)
11. Several points covered in oddly airy response (6)
12. Footballer put off outside goal (8)
13. Politician's lying finally finished – and also not (8)
14. Foot spy dipped into water? On the contrary (7)
15. Never miss quiz show which inspired four groups of four in this grid (4,7)
16. Dahl character - a Salt knocked back after seeing some geese? (6)
17. One bouncing off the walls ultimately became lethargic couch potato (4)
18. Students of French enthralled by derrières (7)

Down

1. Prestigious award presented by no-mark? (5)
2. I could go on horse to make an impression (4)
3. Clergyman's a bit of a booby, possibly dropping a tablet (6)
4. Shakespearean king determined Christmas must be overturned (7)
5. Top spy replaces lead for fancy audio equipment (4)
6. Happening around the fifth, something burning this month (8)
7. After bungling order, he'd be on a plank (8)
8. No end of nutrition for wild flower (6)
9. Legendary hunter mounting leopard or minotaur hides (6)
10. Leading lady disseminating OC trivia (8)
11. One who founded dynasty in America after gold rush (8)
12. Socialist policy which may be a deal breaker (3,4)
13. Frolic on adult beach in Spain (5)
14. Maybe Methuselah cracked almond (3,3)
15. King casually calls for toast with pork pie (7)
16. A slap-up spread somewhere in Scandinavia (7)